The External Anatomy of Spiders 



Genital Bulb 



Internal parti 



Receptaculum seminis 

 Fundus 

 Reservoir 

 Ejaculatory duct 

 External parts 



Basal di\ ision of the bulb 

 Basal haematodocha 

 Petiole 

 Subtegulum 



Lunate plate 

 Anelli of the subtegulum 

 Middle division (if the bulb 

 Middle haematodocha 

 Tegulum 



Median apophysis 

 Paramedian apophysis 

 Apical division of the bulb 

 Conductor 

 Embolic subdivision 

 Radix 

 Stipes 

 Embolus 



Body of embolus 

 Pars pendula 



Apical sclerite of the embolus 

 Distal ha'matodocha 

 Lateral subterminal apophysis 

 Mesal subterminal apophysis 

 Terminal apophysis, sometimes developed into a fulcrum 



NAMES OF THE PARTS OF THE PALPUS AND ABBREVIATIONS USED FOR THEM IN THE 



ILLUSTRATIONS 



Accessory branch = paracymbium. Mesal subterminal apophysis, m. st. a. 



Alveolus, a. Middle division of the bulb, m. d. 



Anelli of the subtegulum, an. Middle haematodocha, m. h. 



Apical division of the bulb, a. d. Paracymbium, p. c. 



Apical sclerite of the embolus, a. s Paramedian apophysis, p. m. a. 



Basal division of the bulb, b. d. Pars pendula of the embolus, p. p. 



Basal haematodocha, b. b. Patella, p. 



Clavis = median apophysis Petiole of the bulb, pet. 



Conductor of the embolus, con. Radix, ra. 



Coxa, c. Receptaculum seminis, r. s. 



Coxal spur, c. s. Reservoir, res. 



Cymbium, cym. Scopus = median apophysis. 



Distal haematodocha, d. h. Spiral muscle = haematodocha. 



I jaculatory duct, ej. d. Stipes, st. 



Hmbolic subdivision of the bulb, e. s. Style = embolus. 



Embolus, enib. Subtegulum, s. teg. 



Femur,/. Tegulum, teg. 



Fulcrum, Jul. Terminal apophysis, t. a. 



fundus of the receptaculum seminis, fu. Tibia, t. 



Lateral subterminal apophysis, /. st. a. Trochanter, tr. 



Lunate plate = subtegulum in part. Trunk of the embolus, i. e. 



Median apophysis, m. a. Tutaculum, tu. 



THE THORAX 



i 

 The thorax is that part of the cephalothorax which bears 



the four pairs of legs. It is either slightly separated from the 



head by a furrow, or completely coalesced with it. 



The Tergum of the Thorax.— The dorsal aspect of the 



thorax, or the tergum, is by far the most prominent part of this 



12 I 



